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Old 04-21-2010, 19:38   #3
RainierArms
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Join Date: Oct 2004
Posts: 182
You shouldn't need a compatibility chart as most AR15 parts are interchangeable. There are times when you have a in-spec upper and and in-spec lower that will not even fit together. Since milspec calls for a certain amount of tolerance, if they are both at the opposite end of the spectrum, it may not work well together. You can have one set fit perfectly and another set be a rattle can or something so tight you need a mallet to put together. As stated before, I've had a very reputable company's upper & lower that didn't even fit together.
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